2.4 GHz and 5.0 GHz refer to the RF band a router uses to emit its Wi-Fi network. Routers in Australia are either 2.4 GHz only or ‘dual band’ [both 2.4GHz and 5.0 GHz networks]. Mercator Ikuü products can only connect to the 2.4GHz band. Click here for help on checking your specific router.